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authorJason Gunthorpe <jgunthorpe@obsidianresearch.com>2015-11-25 14:05:32 -0700
committerJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2015-12-20 15:23:46 +0200
commit25112048cd59930e23775cafb88e18cfb484892c (patch)
tree12847b70d58372af1d44c69cc83d9821cd773e91 /drivers/char/tpm
parent036bb38ffb3e4c92361108f324364b0341cd9e31 (diff)
downloadblackbird-op-linux-25112048cd59930e23775cafb88e18cfb484892c.tar.gz
blackbird-op-linux-25112048cd59930e23775cafb88e18cfb484892c.zip
tpm: rework tpm_get_timeouts()
IRQ probing needs to know that the TPM is working before trying to probe, so move tpm_get_timeouts() to the top of the tpm_tis_init(). This has the advantage of also getting the correct timeouts loaded before doing IRQ probing. All the timeout handling code is moved to tpm_get_timeouts() in order to remove duplicate code in tpm_tis and tpm_crb. [jarkko.sakkinen@linux.intel.com: squashed two patches together and improved the commit message.] Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Tested-by: Martin Wilck <Martin.Wilck@ts.fujitsu.com> Tested-by: Scot Doyle <lkml14@scotdoyle.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Acked-by: Peter Huewe <peterhuewe@gmx.de>
Diffstat (limited to 'drivers/char/tpm')
-rw-r--r--drivers/char/tpm/tpm-interface.c15
-rw-r--r--drivers/char/tpm/tpm_crb.c14
-rw-r--r--drivers/char/tpm/tpm_tis.c33
3 files changed, 34 insertions, 28 deletions
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index afdc83602e9f..e2fa89c88304 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -503,6 +503,21 @@ int tpm_get_timeouts(struct tpm_chip *chip)
struct duration_t *duration_cap;
ssize_t rc;
+ if (chip->flags & TPM_CHIP_FLAG_TPM2) {
+ /* Fixed timeouts for TPM2 */
+ chip->vendor.timeout_a = msecs_to_jiffies(TPM2_TIMEOUT_A);
+ chip->vendor.timeout_b = msecs_to_jiffies(TPM2_TIMEOUT_B);
+ chip->vendor.timeout_c = msecs_to_jiffies(TPM2_TIMEOUT_C);
+ chip->vendor.timeout_d = msecs_to_jiffies(TPM2_TIMEOUT_D);
+ chip->vendor.duration[TPM_SHORT] =
+ msecs_to_jiffies(TPM2_DURATION_SHORT);
+ chip->vendor.duration[TPM_MEDIUM] =
+ msecs_to_jiffies(TPM2_DURATION_MEDIUM);
+ chip->vendor.duration[TPM_LONG] =
+ msecs_to_jiffies(TPM2_DURATION_LONG);
+ return 0;
+ }
+
tpm_cmd.header.in = tpm_getcap_header;
tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 4bb9727c1047..8342cf51ffdc 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -284,17 +284,9 @@ static int crb_acpi_add(struct acpi_device *device)
chip->vendor.priv = priv;
- /* Default timeouts and durations */
- chip->vendor.timeout_a = msecs_to_jiffies(TPM2_TIMEOUT_A);
- chip->vendor.timeout_b = msecs_to_jiffies(TPM2_TIMEOUT_B);
- chip->vendor.timeout_c = msecs_to_jiffies(TPM2_TIMEOUT_C);
- chip->vendor.timeout_d = msecs_to_jiffies(TPM2_TIMEOUT_D);
- chip->vendor.duration[TPM_SHORT] =
- msecs_to_jiffies(TPM2_DURATION_SHORT);
- chip->vendor.duration[TPM_MEDIUM] =
- msecs_to_jiffies(TPM2_DURATION_MEDIUM);
- chip->vendor.duration[TPM_LONG] =
- msecs_to_jiffies(TPM2_DURATION_LONG);
+ rc = tpm_get_timeouts(chip);
+ if (rc)
+ return rc;
chip->acpi_dev_handle = device->handle;
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 513f30efd9d3..56a295d328c7 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -740,6 +740,16 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
dev_dbg(dev, "\tData Avail Int Support\n");
+ /* Very early on issue a command to the TPM in polling mode to make
+ * sure it works. May as well use that command to set the proper
+ * timeouts for the driver.
+ */
+ if (tpm_get_timeouts(chip)) {
+ dev_err(dev, "Could not get TPM timeouts and durations\n");
+ rc = -ENODEV;
+ goto out_err;
+ }
+
/* INTERRUPT Setup */
init_waitqueue_head(&chip->vendor.read_queue);
init_waitqueue_head(&chip->vendor.int_queue);
@@ -837,18 +847,13 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
iowrite8(irq_r, chip->vendor.iobase +
TPM_INT_VECTOR(chip->vendor.locality));
- if (chip->flags & TPM_CHIP_FLAG_TPM2) {
- chip->vendor.timeout_a = msecs_to_jiffies(TPM2_TIMEOUT_A);
- chip->vendor.timeout_b = msecs_to_jiffies(TPM2_TIMEOUT_B);
- chip->vendor.timeout_c = msecs_to_jiffies(TPM2_TIMEOUT_C);
- chip->vendor.timeout_d = msecs_to_jiffies(TPM2_TIMEOUT_D);
- chip->vendor.duration[TPM_SHORT] =
- msecs_to_jiffies(TPM2_DURATION_SHORT);
- chip->vendor.duration[TPM_MEDIUM] =
- msecs_to_jiffies(TPM2_DURATION_MEDIUM);
- chip->vendor.duration[TPM_LONG] =
- msecs_to_jiffies(TPM2_DURATION_LONG);
+ if (tpm_get_timeouts(chip)) {
+ dev_err(dev, "Could not get TPM timeouts and durations\n");
+ rc = -ENODEV;
+ goto out_err;
+ }
+ if (chip->flags & TPM_CHIP_FLAG_TPM2) {
rc = tpm2_do_selftest(chip);
if (rc == TPM2_RC_INITIALIZE) {
dev_warn(dev, "Firmware has not started TPM\n");
@@ -864,12 +869,6 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
goto out_err;
}
} else {
- if (tpm_get_timeouts(chip)) {
- dev_err(dev, "Could not get TPM timeouts and durations\n");
- rc = -ENODEV;
- goto out_err;
- }
-
if (tpm_do_selftest(chip)) {
dev_err(dev, "TPM self test failed\n");
rc = -ENODEV;
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